Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 350 [Rate centres in NPA 350] [Dial plan for NPA 350]

NXX: 503

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
350-503 A Merced CA SKTNCA01XKZ  624H ONVOY SPECTRUM, LLC 738   2024-01-15   
350-503 0 Merced CA SKTNCA01XKZ  624H ONVOY SPECTRUM, LLC 738   2024-01-15   
350-503 1 Merced CA SKTNCASLAMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2024-01-29   
350-503 2 Merced CA SKTNCASLAMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2024-05-30   
350-503 3 Merced CA SKTNCASLAMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2024-06-28   
350-503 5 Merced CA SKTNCASLAMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2024-08-26   
350-503 6 Merced CA SKTNCA01XFY  649C ONVOY, LLC - CA 738   2024-06-07   
350-503 7 Merced CA SKTNCA01XFY  649C ONVOY, LLC - CA 738   2024-06-07   
350-503 8 Merced CA SKTNCA01XFY  649C ONVOY, LLC - CA 738   2024-03-24   
350-503 9 Merced CA SKTNCASLAMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2024-04-26   

Last updated: Sat, 02 May 2026 12:20:53 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.